I have an issue with the ADF4001. The VCO output is connected to the RF_IN_A input of the ADF4001. I have measured the signal of the VCO to be about 1Vpp.
However, if I measure the output of the N- counter at the MUXOUT, there is no signal. R-counter does work at the muxout.
The VCO type is CVCO33CL-0110-0150 of Crystek.
Does anybody know what is wrong?